Thankyou Slowhands. I had found Elizabeth's baptism & marriage certs, but couldn't get any further. The advanced search didn't want to work - or maybe it was what I was doing with it :) Your census returns are very helpful - so, again, thanks.
The Charles Plaisteds must have left during the agricultural downturn in the 1860's/70s - like many others, they went to NZ. Don't have the year or vessel, yet - but when I do, will post on the Emigration Board.
Linda
P.S. My husband's family.